Document Detail

The p38 MAPK PMK-1 shows heat-induced nuclear translocation, supports chaperone expression, and affects the heat tolerance of Caenorhabditis elegans.
MedLine Citation:
PMID:  23117578     Owner:  NLM     Status:  Publisher    
The p38 mitogen-activated protein kinase PMK-1 of Caenorhabditis elegans has been associated with heavy metal, oxidative and pathogen stress. Pmk-1 is part of an operon comprising three p38 homologues, with pmk-1 expression suggested to be regulated by the operon promoter. There are contradictory reports about the cellular localization of PMK-1. We were interested to study principles of pmk-1 expression and to analyze the role of PMK-1 under heat stress. Using a translational GFP reporter, we found pmk-1 expression to be driven by a promoter in front of pmk-1. PMK-1 was detected in intestinal cells and neurons, with a cytoplasmic localization at moderate temperature. Increasing temperature above 32 °C, however, induced a nuclear translocation of PMK-1 as well as PMK-1 accumulation near to apical membranes. Testing survival rates revealed 34-35 °C as critical temperature range, where short-term survival severely decreased. Mutants of the PMK-1 pathway (pmk-1Δ, sek-1Δ, mek-1Δ) as well as a mutant of JNK pathway (jnk-1Δ) showed significantly lower survival rates than wild-type or mutants of other pathways (kgb-1Δ, daf-2Δ). Rescue and overexpression experiments verified the negative effects of pmk-1Δ on heat tolerance. Studying gene expression by RNA-seq and semi-quantitative reverse transcriptase polymerase chain reaction revealed positive effects of the PMK-1 pathway on the expression of genes for chaperones, protein biosynthesis, protein degradation, and other functional categories. Thus, the PMK-1 pathway is involved in the heat stress responses of C. elegans, possibly by a PMK-1-mediated activation of the transcription factor SKN-1 and/or an indirect or direct PMK-1-dependent activation (hyperphosphorylation) of heat-shock factor 1.
Ansgar Mertenskötter; Alex Keshet; Peter Gerke; Rüdiger J Paul
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-11-2
Journal Detail:
Title:  Cell stress & chaperones     Volume:  -     ISSN:  1466-1268     ISO Abbreviation:  Cell Stress Chaperones     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-2     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9610925     Medline TA:  Cell Stress Chaperones     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Institute of Zoophysiology, University of Münster, Schlossplatz 8, 48143, Münster, Germany,
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